19 research outputs found
La Bibliotecologia y sus origenes
Full text linkThis article analyzes the historical processes
surrounding de emergence of a Library Science.
Singularities of library history are outlined as
relevant part of its genesis as a discipline. It also
sketches some factors concerning the gestation
of Library Science as a field of knowledge and
discusses the incidence of Documentation over
the field of interest. The author draws conclusions.
The article includes bibliography
Limitations for Daytime Detection of Stars Using the Intensifier Image Orthicon
Full text linkAuthor Institution: Aeronautical Research Laboratories, Wright-Patterson Air Force Base, Ohi
The Limitations in Resolution and Discrimination in Brightness Differences for Light Amplifier Systems Using Contrast Enhancement
Full text linkAuthor Institution: Aeronautical Research Laboratory, Air Force Research Division, Air Research and Development Command, United States Air Force, Wright-Patterson Air Force Base, Ohi
The Limitations for Night-Time Detection of Celestial Bodies Employing the Intensifier-Storage-Image Orthicon
Full text linkAuthor Institution: Aeronautical Research Laboratory, Wright-Patterson Air Force Base, Ohi
Fake news y ciberpolítica. Análisis del impacto social y político de las noticias falsas viralizadas en Facebook, Twitter y Whatsapp durante el paro nacional de octubre del 2019
No full textEl presente trabajo tiene como objetivo resaltar los graves problemas sociales y políticos que ocasionaron las noticias falsas en el contexto de las protestas de octubre del 2019 en el Ecuador. Para ello se parte de una base teórica sobre la política y la manipulación, la ciberpolitica, las redes sociales y el fenómeno de las noticias falsas. A partir de estos conceptos, se analizan las noticias con contenido engañoso emitidas desde políticos (oficialistas u opositores) y las emitidas o repoducidas por usuarios en redes sociales. En este trabajo se logró identificar la manipulación ejercida por parte del Gobierno ecuatoriano ayudado por los medios de comunicación tradicionales hacia la población y los intereses de ciertos grupos políticos opositores que buscaban la renuncia del Presidente de la República ayudados por la rápida difusión de información no verificada en las redes sociales como Facebook, Twitter y la aplicación de mensajería instantánea Whatsapp.The present research work highlights the severe social and political problems caused by fake news in the context of the October 2019 protests in Ecuador. To do this, the author starts from a theoretical basis on politics and manipulation, cyberpolitics, social networks, and the phenomenon of fake news. Based on these concepts, news with misleading content issued by politicians (government officials or opponents) and published or reproduced by users on social networks are analyzed. In this research, it was possible to identify the Ecuadorian government's manipulation, aided by the traditional media. Towards the population and the interests of certain opposition political groups that sought the resignation of the President of the Republic, aided by the rapid dissemination of unverified information on social networks such as Facebook, Twitter, and the instant messaging application WhatsApp
Optical Radar and Passive Optoelectronic Ranging
Full text linkAuthor Institution: Aerospace Research Laboratories, Wright-Patterson Air Force Base, OhioThe purpose of this paper is to present the fundamental technical arrangement involved for optical radar, its resolution, and requirements concerning the light source for use with it. Some basic optical radar problems are explained and pertinent equations are derived.
The paper shows that 1017 quanta per pulse at a repetition rate of 77 per second are sufficient to achieve optical radar. For this a minimum volume of only 1 mm3 is required for a luminescent semiconductor to produce this quanta flux. The light source does not necessarily have to be a laser, since the narrow bandwidth of the lasers cannot, by the present state of the art, be fully utilized with the overall optical bandwidth of such a system. If a source can produce the necessary quanta flux with a bandwidth of not more than about 20 A, the job will be as well performed by this source as by a laser. Very promising luminescent semiconductors for such an endeavor, using the visible spectrum, seem to be the II-VI compounds. An automatic passive optical range-finder system using a special pick-up transducer (conceived by the author) which automatically suppresses any background structure (clouds, etc.) is explained
Astronomical Photographic Recording with and Without Electronic Light Intensification
Full text linkAuthor Institution: Solid State Physics Research Laboratory, Aeronautical Research Laboratories, Wright-Patterson Air Force Base, Ohi
Comments on Techniques Applicable to Determinations of Spatial Distribution on Intensity and Chromaticity
Full text linkAuthor Institution: Aerospce Research Laboratories, Wright-Patterson Air Force Base, OhioAn instrumentation and method for analysing the spatial behaviour of optical properties of pertinent specimens is described, which performs opto-mechanical scanning with a multi-detector arrangement, uses special amplifiers for modification and a computer for signal evaluation, etc. The instrumentation is capable of identifying colors in the CIE color triangle and of making analyses of spectrographic plates possible by opto-electronic processing, which produces information too laborious to obtain otherwise or which cannot be perceived by direct visual examination of the spectrographic plates, especially if a stigmatic spectrograph has been used for the spectrographic plates
Concerto Carioca 3 by Radamés Gnattali : an analytical study
No full textOrientador: Antônio Rafael Carvalho dos SantosDissertação (mestrado) - Universidade Estadual de Campionas, Instituto de ArtesResumo: Esta pesquisa, de cunho musicológico e analítico, apresenta uma versão impressa e uma análise musical do Concerto Carioca nº 3, de Radamés Gnattali, composto no início da década de 1970, até então encontrado manuscrito pelo próprio autor. O processo de edição foi financiado pelo grupo Quatro a Zero e teve uma revisão realizada por Roberto Gnattali e outra realizada pelo autor desta dissertação. A fundamentação teórica da análise foi baseada nos livros Harmony e Orchestration de Walter Piston, Twentieth-Century Harmony de Vincent Persichetti, Materials and Techniques of Twentieth-Century Music de Stefan Kostka, A guide to Schenkerian Analysis de David Neumeyer e Susan Tepping, Analytic Approaches to Twentieth-Century Music, de Joel Lester e no artigo de Richard Cohn "Introduction to Neo-Riemannian theory: A survey and a historical perspective". Utilizando uma abordagem Neo-Riemanniana aliada ao uso da Teoria dos Conjuntos, foi possível demonstrar como o compositor estrutura esta grande obra, aliando sonoridades tonais diatônicas e octatônicas, com trechos pós tonais, apontando Radamés como um compositor criativo e ao mesmo tempo consciente da condução dos planos formais em uma obra de vulto. Demonstrar também como o compositor, grande conhecedor da música popular brasileira, utiliza os ritmos e os conceitos formais oriundos desta música para estruturar esta obra clássicaAbstract: This musicological and analytical research presents a printed version and a musical analysis of the Concerto Carioca No. 3 by Radames Gnattali, composed out in early 1970s, previously found in manuscript version by the author. The editing process was financed by the musical group Quatro a Zero and was reviewed by Roberto Gnattali and the author of this dissertation. The analysis theoretical foundation was based on the books Harmony and Orchestration by Walter Piston, Twentieth-Century Harmony by Vincent Persichetti, Materials and Techniques of Twentieth-Century Music by Stefan Kostka, A guide to Schenkerian Analysis by David Neumeyer and Susan Tepping, Analytic Approaches to Twentieth-Century Music by Joel Lester and Richard Cohn's article Introduction to Neo- Riemannian Theory: a survey and a historical perspective. Using a Neo-Riemannian approach allied to Pitch set Theory, it could be shown how the composer created the structure of this large work, combining tonal diatonic and octatonic sonorities with posttonal passages, showing Radames as a creative and at the same time conscious composer when conducting formal plans of a large work. It also shows how the composer, an expert in Brazilian popular music, uses the rhythms and the formal concepts from this music to compose this classical workMestradoFundamentos TeoricosMestre em Músic
Conversion Yields of Some Photographic Emulsions and Related Factors
Full text linkAuthor Institution: Aerospace Research Laboratories, Wright-Patterson Air Force Base, OhioA method is presented for the determination of the effective average projected grain diameter (d-a) using visual analysis of enlargements of Kodak Tri-X Pan and Kodak Royal-X Pan emulsions. Each was exposed to three light sources of color temperatures 6100°K, 2850°K, and 2040°K, and was developed in Kodak developers HC-110, DK-50, and D-19 for 5, 8, 12, and 20 minutes at 68°F. For 5- to 20-minute developing times, dA was determined, from a total of over 12,000 counts, to be from ~ 2.1 to ~ 2.4 u for both films. A method for calculating the conversion yield -q (number of grains to total number of quanta focused on the emulsion) is derived. The value y is a function of film density (D); it was found that rj first increases and then decreases, and a theory which explains this behavior in connection with grain formation is proposed; that is, 77 is the result of a superposition of an increasing and a decreasing function. The first is caused by the fact that a photographic nucleus made up of three silver atoms has a lesser probability for development than a four-atom nucleus, where with the increased exposure (number of quanta per unit area), the ratio increases in favor of the latter, resulting in an increasing function. However, the photographic plate, unlike the photoemitter, is a "non-speciereplacing" device; as a result, the percentage of nonactivated silver halides decreases with exposure, making the latter a decreasing function. Typical values for 77 showing this behavior are: Tri-X Pan; 6100°K, spectral region 375 to 700 m/x; HC-110, 8 min, 68°F; ij~0.1% at D = 0.10, T7~O.3% at D = 0.30, rj~0.1% at D = 1.00, and' ^ 0 . 0 0 9% at D = 2.00. For A = 466 mn (peak of P-ll phosphor), r, increases from ~ 0.09% at D = 0.10 to ~ 0.4% at D = 0.40, then decreases to ~ 0.2% at D = 1.00 and ~ 0.01% at D = 2.00
